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Donkey Conservation status: Domesticated |
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| Equus asinus Linnaeus, 1758 |
The donkey, a.k.a. Annes (Equus asinus, hence also ass), is a domesticated animal of the horse family, Equidae. The word also applies to a type of apparatus.
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The word "donkey" is one of the most etymologically obscure in the English language. Until quite recent times, the standard word was "ass" also known as purvi, which has clear cognates in most other Indo-European languages; no credible cognate for "donkey" has yet been identified, though it is possible that it is a diminutive of "dun" (dull greyish-brown), a typical donkey colour; originally, "donkey" was pronounced to rhyme with "monkey". In the late 18th century, the word "donkey" started to replace "ass", almost certainly to avoid confusion with the word "arse", which, due to sound changes that had affected the language, had come to be pronounced the same way (/æs/ > /ɑ:s/ and /ɑ:rs/ > /ɑ:s/). The /ɑ:s/ pronunciation of "ass" was eventually restored to /æs/ in order to reserve the distinction, but not without the curious consequence of American English losing the word "arse" entirely and handing over its meaning to "ass".
A male donkey can be crossed with a female horse to produce a mule. A male horse can be crossed with a female donkey (jennet or jenny) to produce a hinny. These hybrids are almost always sterile because horses have 64 chromosomes whereas donkeys have 62, producing offspring with 63 chromosomes. Due to different mating behavior, jacks are often more willing to cover mares than stallions are to breed jennets. Mules are much more common than hinnies. This is believed to be caused by two factors, the first being proven in cat hybrids, that when the chromosome count of the male is the higher, fertility rates drop (as in the case of stallion x jennet). The lower progesterone production of the jennet may also lead to early embryonic loss. Although it is commonly believed that mules are more easily handled and also physically stronger than hinnies, making them more desirable for breeders to produce, it is simply that mule are more common in total number.
Donkeys carrying loads in Tibet
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Classic British seaside donkeys in Skegness
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Domestication of the donkey circa 4000 BC is credited to predynastic Egypt (see Domestication). In particular, the donkey has been cited as the most probable beast of burden employed enroute between the First dynasty of Egypt (and perhaps earlier) and turquoise mining camps in the Sinai Peninsula (see Sinai Peninsula), as mention of the dromedary in Ancient Egypt does not appear until far later in the early 2nd millennium BC (see [1]).
Donkeys were also used in the prehistoric eras of Europe and western Asia, for pulling carts and carrying loads (including riders). Though not as fast as horses, donkeys are long-lived, cheaper to maintain, have great endurance, and are agile on poor tracks. They remain of crucial economic importance in many developing countries.
Donkeys have a reputation for stubbornness, but this is due to some handlers' misinterpretation of their highly-developed sense of self preservation. It is difficult to force or frighten a donkey into doing something it sees as contrary to its own best interest, as opposed to horses who are much more willing to, for example, go along a path with unsafe footing.
Although formal studies of their behaviour and cognition are rather limited, donkeys appear to be quite intelligent, cautious, friendly, playful, and eager to learn. They are many times fielded with horses due to a perceived calming effect on nervous horses. If a donkey is introduced to a mare and foal, the foal will often turn to the donkey for support after it has left its mother. [2]
Once a person has earned their confidence they can be willing and companionable partners in work and recreation. For this reason, they are now commonly kept as pets in countries where their use as beasts of burden has disappeared. They are also popular for giving rides to children in holiday resorts or other leisure contexts.
In prosperous countries, the welfare of donkeys both at home and abroad has recently become a concern, and a number of sanctuaries for retired donkeys have been set up.
With domestication of almost all donkeys, few species now exist in the wild. Some of them are the African Wild Ass (Equus africanus) and its subspecies Somalian Wild Ass (Equus africanus somaliensis). The Asiatic wild ass or Onager, Equus hemionus, and its relative the Kiang, Equus kiang, are closely related wild species.
There was another extinct subspecies called the Yukon Wild Ass (Equus asinus lambei). In the wild the asses can reach top speeds equalling zebras and even most horses.
The Wild Burro of the Southwestern United States is the descendent of the beasts of burden used and abandoned by the early prospectors. These animals, considered to be a living legacy, have lately been at risk due to drought. The Bureau of Land Management conducts round-ups of endangered herds, and holds public auctions. More information can be obtained from U.S. Department of the Interior, Bureau of Land Management.
Wild burros make good pets when treated well and cared for properly. They are clever and curious. When trust has been established, they appreciate, and even seek, attention and grooming.
The long history of human use of donkeys means that there is a rich store of cultural references to them, including:
The donkey has also been a long-time unofficial symbol of the Democratic Party of the United States since Andrew Jackson's 1828 US presidential campaigns, defying the republican campaign calling him a "jackass"" - see [4] .
For other uses of the word mule, see mule (disambiguation).
In its common modern meaning, a mule is the offspring of a male donkey and a female horse. Compare hinny — the offspring of a male horse and a female donkey. The term "mule" (Latin mulus) was formerly applied to the offspring of any two creatures of different species — in modern usage, a "hybrid".
The mule, easier to breed and usually larger in size than a hinny, has monopolised the attention of breeders. The chromosome match-up more often occurs when the jack (male donkey) is the sire and the mare (female horse) is the dam. It has been known for people to let a stallion (male horse) run with a jenny (female donkey) for as long as six years before getting her pregnant. Male mules and hinnies are both sterile, as are almost all female mules and hinnies (see External links). The sterility is attributed to the different number of chromosomes the two species have. Donkeys have 62 chromosomes, while horses have 64.
A female mule, called a "molly," has estrus cycles and can carry a fetus, as has occasionally happened naturally but also through embryo transfer. The difficulty is in getting the molly pregnant in the first place.
In its short thick head, long ears, thin limbs, small narrow hooves, short mane, absence of chestnuts (horny growths) inside the hocks, and tail hairless at the root, the mule appears asinine in form. In height and body, shape of neck and croup, uniformity of coat, and teeth, it appears equine. Also characteristic of the mule is its enormous phallus, hence the popular colloquial expression. It has the voice neither of the ass nor of the horse, but emits a feeble hoarse noise. Most mules have a brown or bay-brown coat — bay, or bright bay, or piebald occur rarely; a chestnut tint sometimes appears.
The mule possesses the sobriety, patience, endurance and sure-footedness of the ass, and the vigour, strength and courage of the horse. Operators of working animals generally find mules preferable to horses: mules show less impatience under the pressure of heavy weights, while their skin, harder and less sensitive than that of horses, renders them more capable of resisting sun and rain.
Humans have used mules from early times; the inhabitants of Mysia and Paphlagonia allegedly bred the first mules. The ancient Greeks and especially Romans valued mules for transport, employing them to draw carriages and carry loads. Mules hauled barges in the early days of the Erie Canal. In the early 20th century use of mules survived mainly in military transport, being used to haul caissons and artillery through nearly impassable terrain, the bravery and focused intelligence of the animal serving it well in the midst of the noise and confusion of warfare.
Mules have become far less common since the rise of the automobile, the motorized tractor, and other internal combustion-powered vehicles. They still find employment in less-developed countries, and in certain specialized roles for which they are still aptly suited. Mules can negotiate well on narrow, steep trails — such as the route from the South Rim down into the Grand Canyon. (The animal used for tourist transport on the Bright Angel Trail in the Grand Canyon is the burro, a variety of donkey.) Mules (and burros) can handle extremely rugged terrain and tracks that are too steep and twisted for either the less sure-footed horse or for a motor vehicle. Mules are also shown at equine shows.
This article incorporates text from the 1911 Encyclopædia Britannica, which is in the public domain.